Panettiere died Sunday at the age of 36.

The Greenville County Coroner’s Office said Monday that the cause of death is pending further investigation. An autopsy was completed Monday, the statement added, and “no signs of trauma were discovered that would have contributed to the death.”

Authorities received a 911 call Sunday around 1:50 p.m. about a “reported cardiac arrest” at an apartment complex, according to the coroner’s office. Police said an acquaintance of Panettiere’s made the 911 call but did not identify the acquaintance.

“The preliminary investigation has not indicated any signs of foul play or suspicious circumstances,” police said in a news release.

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New details in Hayden Panettiere’s sudden death

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Panettiere was best known for her roles in the television shows “Heroes” and “Nashville” and had recently published a memoir, “This Is Me: A Reckoning,” which generated headlines over its revelations — including some about her past relationships.

Panettiere revealed earlier this year that she previously struggled with postpartum depression and addiction, which she said led to her decision to give up custody of her only child, daughter Kaya Evdokia Klitschko, in 2018.

Panettiere said she had always wanted to be a mother but discussed her sadness amid her postpartum depression, in a tearful interview on the “Jay Shetty Podcast” in May.

Despite being apart from her daughter after she gave up custody to Klitschko, Panettiere told Shetty, she formed a strong bond with her child.

“I will always want her here. I always miss her,” she said. “I always want to have my arms wrapped around her, but that’s just not the way life is right at this moment.”

Klitschko and Panettiere announced their engagement in 2013. It was after Panettiere gave birth to their daughter in 2014 that her life began spiraling out of control, she wrote in her memoir.

She later went into rehab and reluctantly signed over custody of Kaya to her father when the child was nearly 3 years old. By 2018, she and Klitschko were no longer engaged.

“I still hadn’t processed everything that had happened with Wlad and Kaya, not to mention my anxiety and depression,” she wrote. She detailed the decision to sign over custody, saying that she thought things might change once she got better but that they never did.

Hayden Panettiere as Juliette Barnes in “Nashville”.Mark Levine / Disney via Getty Images

Panettiere said in interviews that she had developed a good co-parenting relationship with Klitschko, that she was able to visit her daughter in Ukraine and that she regularly talked to her on FaceTime.

If you or someone you know is struggling or in emotional distress, call or text 988 or chat at 988lifeline.org 24/7 to reach the 988 Suicide & Crisis Lifeline. For additional resources, visit SpeakingOfSuicide.com/resources